微囊藻水华的资源化利用:吸附重金属离子Cu^(2+)、Cd^(2+)和Ni^(2+)的实验研究  

Reuse of Microcystis bloom: an experimental study on the adsorption of heavy metals Cu^(2+),Cd^(2+) and Ni^(2+) by bloom biomass

作　　者：吴文娟[1] 李建宏[1] 刘畅[1] 张琪[1] 郭康宁[1] 

机构地区：[1]南京师范大学生命科学学院,南京210023

出　　处：《湖泊科学》2014年第3期417-422,共6页Journal of Lake Sciences

基　　金：国家自然科学基金项目(31370217);国家基础科学人才培养基金项目(J1103507);江苏高校优势学科建设工程项目联合资助

摘　　要：为将捞取的微囊藻水华资源化,用作重金属生物吸附剂,本文研究了在不同金属离子浓度和不同pH条件下微囊藻水华对重金属Cu2+、Cd2+和Ni2+的吸附效果.研究结果显示,重金属离子浓度分别为20.00、60.00、100.00和140.00μg/ml时,150 mg干重微囊藻水华对Cu2+的去除率分别为67.79%、37.47%、35.93%和34.70%,对Cd2+的去除率分别为73.31%、65.87%、60.09%和42.37%,对Ni2+的去除率分别为47.89%、31.87%、28.46%和21.61%.在较低的重金属浓度(20.00μg/ml)下,微囊藻对3种重金属的去除率最高.但从单位微囊藻生物量吸附重金属量来看,金属离子初始浓度越高,吸附重金属的总量越高;在相同金属浓度下,微囊藻水华对3种金属的吸附效率:Cd2+>Cu2+>Ni2+.微囊藻吸附Cu2+的最适pH为5.0,Cd2+和Ni2+均为6.0,20.00μg/ml浓度时去除率分别达到了71.90%、85.67%和55.43%.微囊藻裂解释放的可溶性物质对重金属吸附影响不大.研究结果显示微囊藻水华可作为重金属吸附剂有效地运用于重金属污水处理.In this study, we investigated the adsorption of heavy metals Cu2 ＋ , Cd2 ＋ and Ni2 ＋ by natural Microcystis bloom bio- mass in different concentrations and different pH levels. The results showed that when the heavy metal concentrations were 20.00, 60.00, 100.00 and 140.00 μg/ml, the removal efficiencies （REs） of Cu2＋ were 67.79%, 37.47%, 35.93% and 34.70%, respectively, adsorbed by 150 mg dry weight Microcystis bloom. REs of Cd2＋ were 73.31% , 65.87% , 60.09% and 42.37% , and REs of Ni2＋ were 47.89% , 31.87% , 28.46% and 21.61% , respectively. At the lower metal concentration level of 20.00 μg/ml, REs of three heavy metals were the highest. A higher initial metal ion concentration resulted in a higher adsorption capability based on per gram biomass. REs of three metals was Cd2 ＋ 〉 Ca2 ＋ 〉 Ni2 ＋ at the same metal concentration level. The optimum pH level for the adsorptions of Cu2 ＋, Cdz ＋ and Ni2 ＋ were 5.0, 6.0 and 6.0, respectively. The highest REs at the optimal pH level reached 71.90% , 85.67% and 55.43% for Cu2 ＋ , Cd2 ＋ and Ni2 ＋ in 20.00 μg/ml metals, respectively. The soluble substances released from Microcystis cells had little influence on the REs. Our results showed that the Microcystis bloom could be used as an effective adsorbent material to remove toxic heavy metals from wastewater.

关 键 词：微囊藻水华 重金属 吸附 CU2+ Cd2+ NI2+ 

分 类 号：X524[环境科学与工程—环境工程] X173